lab 5: shared: added SingleEventTypeEventHandler and made SingleEventType-
EventChannelEventHandler extend from it. taja: added an EventHandler for
handling the reception of job:task_results events and parsing them into
a WordCountTaskResults object and storing it with the corresponding manager.
lab 5: taja: added page for viewing the stored tasks, either for all jobs or
filtered by job id; added retrieveByJobId method to WordCountTaskResults-
Manager to facilitate filtering by job ID.